Surfacing Sound holds eight speakers evenly placed over a five-metre width. The sensors are placed under the speakers. The artefact detects activity of the person, and directs its sound body towards the person. Both the movement and the distance towards the wall influence the position of the sound body. When you walk along the wall the sound body convincingly follows you. The relation between the position of the sound body and the person appeared to be very subtle. When the sound body follows you too directly, and, so to say, walks in pace with you, the movement of the sound body is hard to perceive. However, when the sound lingers just a little bit behind you, it creates a very strong experience of following you. The auditory experience is surprising.